Rotor assembly, motor, and household appliance

Abstract

The present application discloses a rotor assembly, a motor, and a household appliance. The rotor assembly comprises an inner iron core (100), an outer iron core (200), a plurality of magnetic tiles (300), a plastic encapsulation body (400) and a damping body (500). The outer iron core (200) is arranged along the outer periphery of the inner iron core (100), the plurality of magnetic tiles (300) are installed on the outer peripheral wall of the outer iron core (200) and are spaced apart in the circumferential direction of the outer iron core (200), the plastic encapsulation body (400) encapsulates the magnetic tiles (300) and the outer iron core (200), and the damping body (500) fills the space between the inner iron core (100) and the outer iron core (200). The plastic encapsulation body (400) comprises a first portion, and the damping body (500) comprises a second portion; on a projection plane perpendicular to the axial direction of the rotor assembly, the projections of the first portion and the second portion overlap, and the two opposing wall surfaces of the first portion and the second portion perpendicular to the axial direction abut against each other.

Description

Rotor assembly, motor and household appliance

[0001]

[0002] Cross-reference to related applications

[0003] The present application claims priority to Chinese Patent Application No. 202411329736.3, filed on September 20, 2024, entitled “Rotor assembly, motor and household appliance”, and Chinese Patent Application No. 202422322822.3, filed on September 20, 2024, entitled “Rotor assembly, motor and household appliance”, the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0004] The present application relates to the technical field of motors, and in particular to a rotor assembly, a motor and a household appliance. BACKGROUND

[0005] For a surface-mounted rotor motor, in order to ensure the installation stability of the magnetic tile and improve the motor noise, in the related art, engineering plastic is wrapped around the magnetic tile and the outer iron core of the rotor, so that the magnetic tile is stably installed on the outer iron core, and elastic damping material is filled between the outer iron core and the inner iron core of the rotor to reduce vibration, thereby achieving the purpose of improving the motor noise. However, in the existing motor structure, the engineering plastic is only used to fix the magnetic tile on the outer iron core, and the elastic damping material only covers part of the axial end surface of the outer iron core, the bonding force between the elastic damping material and the outer iron core in the axial direction is small, and at the same time, due to the large difference in shrinkage rate between the engineering plastic and the elastic damping material, a gap will be generated at the joint between the engineering plastic and the elastic damping material. As a result, the bonding force between the outer iron core and the inner iron core is small, and the relative displacement between the outer iron core and the inner iron core is prone to occur, especially under the drop working condition, the outer iron core and the inner iron core will be separated. SUMMARY

[0006] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a rotor assembly which can increase the axial bonding force between the plastic package body and the damping body, thereby increasing the bonding force between the outer iron core and the inner iron core, avoiding relative displacement or separation, and improving the structural stability.

[0007] The present application also provides a motor and a household appliance having the above-mentioned rotor assembly.

[0008] According to the rotor assembly of the first aspect of the present application, the rotor assembly comprises an inner core, an outer core arranged along the outer periphery of the inner core, a plurality of magnetic tiles installed on the outer peripheral wall of the outer core and arranged along the circumferential direction of the outer core, a plastic encapsulation body encapsulating the magnetic tiles and the outer core, and a damping body filled between the inner core and the outer core. The plastic encapsulation body comprises a first part, and the damping body comprises a second part. In a projection plane perpendicular to the axial direction of the rotor assembly, the projection of the first part overlaps the projection of the second part, and the opposite two wall surfaces of the first part and the second part perpendicular to the axial direction are in contact with each other.

[0009] According to the rotor assembly of the first aspect of the present application, the rotor assembly comprises an inner core, an outer core arranged along the outer periphery of the inner core, a plurality of magnetic tiles installed on the outer peripheral wall of the outer core and arranged along the circumferential direction of the outer core, a plastic encapsulation body encapsulating the magnetic tiles and the outer core, and a damping body filled between the inner core and the outer core. The plastic encapsulation body comprises a first part, and the damping body comprises a second part. In a projection plane perpendicular to the axial direction of the rotor assembly, the projection of the first part overlaps the projection of the second part, and the opposite two wall surfaces of the first part and the second part perpendicular to the axial direction are in contact with each other. The first part and the second part are constrained in the axial direction, the constraint of the plastic encapsulation body and the damping body in the axial direction is increased, the axial binding force between the plastic encapsulation body and the damping body is increased, and the binding force between the outer core and the inner core is increased. In the process of rotation of the rotor assembly or in the falling working condition, the relative displacement or separation of the outer core and the inner core is avoided, and the structural stability of the rotor assembly is improved.

[0010] According to some embodiments of the present application, the plastic encapsulation body is provided with a first recess at least at one end along the axial direction, the first recess is recessed along the axial direction, and the damping body is provided with a limiting portion accommodated in the first recess.

[0011] According to some embodiments of the present application, the plastic encapsulation body comprises at least one connecting strip arranged along the axial direction and in contact with the inner peripheral wall of the outer core. The first recess is arranged at the end of the connecting strip along the axial direction, the damping body is provided with a recess cavity accommodating the connecting strip, and the limiting portion is arranged at the end of the recess cavity along the axial direction.

[0012] According to some embodiments of the present application, the damping body is provided with a second recess on one side of the limiting portion along the axial direction, and the connecting strip is partially accommodated in the second recess.

[0013] According to some embodiments of the present application, the number of the connecting strips is a plurality, and the plurality of connecting strips are arranged along the circumferential direction of the outer core. Each of the connecting strips is provided with the first recess.

[0014] According to some embodiments of the present application, the plastic package further comprises a third recess, the third recess is arranged on a part of the bottom wall of the first recess, the bottom wall of the second recess is provided with a first protrusion, and the first protrusion is accommodated in the third recess.

[0015] According to some embodiments of the present application, the number of the third recesses is two, and the two third recesses are arranged along the circumferential direction.

[0016] According to some embodiments of the present application, the third recess extends along the radial direction of the outer iron core to the side wall of the connecting strip towards the inner iron core.

[0017] According to some embodiments of the present application, the plastic package further comprises a fourth recess, the fourth recess is formed on a part of the bottom wall of the third recess and located on the side of the third recess close to the outer iron core, an end surface of the first protrusion is provided with a second protrusion, and the second protrusion is accommodated in the fourth recess.

[0018] According to some embodiments of the present application, the third recess is located on the side of the second recess close to the outer iron core.

[0019] The motor according to the second aspect of the present application comprises the rotor assembly according to the first aspect of the present application.

[0020] The motor according to the second aspect of the present application has at least the following beneficial effects: the motor adopts the above-mentioned rotor assembly, the plastic package is wrapped around the magnetic shoe and the outer iron core, the damping body is filled between the inner iron core and the outer iron core, the plastic package and the outer iron core and the magnetic shoe are combined, the damping body and the outer iron core and the inner iron core are combined, the projection of the first part of the plastic package and the projection of the second part of the damping body overlap on the axial projection surface, and the opposite two wall surfaces of the first part and the second part perpendicular to the axial direction interfere with each other, so that the first part and the second part are constrained in the axial direction, that is, the constraint of the plastic package and the damping body in the axial direction is increased, thereby increasing the axial binding force between the plastic package and the damping body, and further increasing the binding force between the outer iron core and the inner iron core, which avoids the relative displacement or separation of the outer iron core and the inner iron core during the rotation of the rotor assembly or in the falling working condition, and is beneficial to improving the structural stability of the rotor assembly.

[0021] The household appliance according to the third aspect of the present application comprises the motor according to the second aspect of the present application.

[0022] According to the household appliance of the third aspect of the present application, at least the following advantages are achieved: the household appliance adopts the motor described above, the plastic package is wrapped around the magnetic shoe and the outer iron core, the damping body is filled between the inner iron core and the outer iron core, the plastic package and the outer iron core, the magnetic shoe are combined, the damping body and the outer iron core, the inner iron core are combined, the projection of the first part of the plastic package and the projection of the second part of the damping body overlap on the axial projection surface, and the opposite two wall surfaces of the first part and the second part perpendicular to the axial direction interfere with each other, so that the first part and the second part are constrained in the axial direction, that is, the constraint of the plastic package and the damping body in the axial direction is increased, thereby increasing the axial binding force between the plastic package and the damping body, and further increasing the binding force between the outer iron core and the inner iron core, which avoids the relative displacement or separation of the outer iron core and the inner iron core during the rotation of the rotor assembly or in the falling working condition, and is beneficial to improve the structural stability of the rotor assembly.

[0023] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below in conjunction with the drawings and examples, in which:

[0025] Fig. 1 is a structural schematic diagram of a rotor assembly in an embodiment of the present application;

[0026] Fig. 2 is a sectional view of the rotor assembly shown in Fig. 1;

[0027] Fig. 3 is a structural schematic diagram of a plastic package of the rotor assembly shown in Fig. 1;

[0028] Fig. 4 is a structural schematic diagram of a damping body of the rotor assembly shown in Fig. 1;

[0029] Fig. 5 is a sectional view of another direction of the rotor assembly shown in Fig. 1;

[0030] Fig. 6 is a structural schematic diagram of a plastic package in another embodiment of the present application;

[0031] Fig. 7 is a structural schematic diagram of a damping body in another embodiment of the present application;

[0032] Fig. 8 is a structural schematic diagram of a plastic package in still another embodiment of the present application;

[0033] Fig. 9 is an enlarged view of A in Fig. 8;

[0034] Fig. 10 is a structural schematic diagram of a damping body in still another embodiment of the present application;

[0035] Fig. 11 is an enlarged view of B in Fig. 10;

[0036] Fig. 12 is a structural diagram of a plastic sealing body in another embodiment of the present application;

[0037] Fig. 13 is a structural diagram of a shock absorbing body in another embodiment of the present application;

[0038] Fig. 14 is a structural diagram of a rotor assembly in another embodiment of the present application;

[0039] Fig. 15 is a structural diagram of a plastic sealing body of the rotor assembly shown in Fig. 14;

[0040] Fig. 16 is a structural diagram of a shock absorbing body of the rotor assembly shown in Fig. 14;

[0041] Fig. 17 is a sectional view of the rotor assembly shown in Fig. 14;

[0042] Fig. 18 is a structural diagram of a plastic sealing body in another embodiment of the present application;

[0043] Fig. 19 is a structural diagram of a shock absorbing body in another embodiment of the present application;

[0044] Fig. 20 is a structural diagram of a plastic sealing body in another embodiment of the present application;

[0045] Fig. 21 is a structural diagram of a shock absorbing body in another embodiment of the present application;

[0046] Fig. 22 is a structural diagram of a plastic sealing body in another embodiment of the present application;

[0047] Fig. 23 is a structural diagram of a shock absorbing body in another embodiment of the present application;

[0048] Fig. 24 is a structural diagram of a rotor assembly in another embodiment of the present application;

[0049] Fig. 25 is a structural diagram of a plastic sealing body of the rotor assembly shown in Fig. 24;

[0050] Fig. 26 is a structural diagram of a shock absorbing body of the rotor assembly shown in Fig. 24;

[0051] Fig. 27 is a sectional view of the rotor assembly shown in Fig. 24;

[0052] Fig. 28 is a structural diagram of a rotor assembly in another embodiment of the present application;

[0053] Fig. 29 is a structural diagram of a plastic sealing body of the rotor assembly shown in Fig. 28;

[0054] Fig. 30 is a structural diagram of a shock absorbing body of the rotor assembly shown in Fig. 28;

[0055] Fig. 31 is a sectional view of the rotor assembly shown in Fig. 28.

[0056] REFERENCE NUMERALS

[0057] Inner iron core 100; first tooth portion 110;

[0058] Outer iron core 200; second tooth portion 210;

[0059] Magnetic tile 300;

[0060] Plastic package 400; first recess 410; connecting strip 420; first section 421; second section 422; third recess 430; fourth recess 440; first end wall 450; second end wall 460; first flange 470; second flange 480; through hole 490;

[0061] Damping body 500; limiting portion 510; concave cavity 520; connecting column 521; second recess 530; first protrusion 540; second protrusion 550; third end wall 560; fourth end wall 570; fifth recess 580; sixth recess 590. Embodiments of the present application

[0062] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0063] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0064] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0065] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, assembling, cooperating, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0066] Referring to FIGS. 1-31, the first aspect of the present application provides a rotor assembly applied to a motor of a household appliance, which can be an air conditioner, a washing machine, a refrigerator, etc.

[0067] Referring to FIGS. 1 and 2, it can be understood that the rotor assembly is a surface-mounted rotor structure, specifically, the rotor assembly includes an inner core 100, an outer core 200, a plurality of magnetic tiles 300, a plastic package 400, and a damping body 500. Generally, the inner core 100 and the outer core 200 are respectively composed of a plurality of stampings arranged in the axial direction of the rotor assembly. The axial direction of the rotor assembly is the direction of the rotation axis of the rotor assembly, the circumferential direction of the rotor assembly is the direction around the rotation axis, and the radial direction of the rotor assembly is the direction perpendicular to the rotation axis and pointing from the outer peripheral wall of the rotor assembly to the rotation axis and its reverse. The axial direction of the inner core 100 and the axial direction of the outer core 200 are the axial direction of the rotor assembly, the circumferential direction of the inner core 100 and the circumferential direction of the outer core 200 are the circumferential direction of the rotor assembly, and the radial direction of the inner core 100 and the radial direction of the outer core 200 are the radial direction of the rotor assembly. For ease of description, the axial direction, the circumferential direction, and the radial direction described below are all the rotor assembly. In addition, the side close to the rotation axis in the radial direction is defined as the inner side, and the side away from the rotation axis is defined as the outer side.

[0068] Referring to FIGS. 1 and 2, it can be understood that the inner core 100 and the outer core 200 are both annular, wherein the inner core 100 is provided with an axial hole at the middle position for installing the rotating shaft of the rotor assembly, and the inner core 100 further includes a plurality of first tooth portions 110, for example, the number of the first tooth portions 110 is four, the first tooth portions 110 are arranged outwardly in the radial direction, and the plurality of first tooth portions 110 are arranged equidistantly in the circumferential direction. In the projection plane perpendicular to the axial direction, the projection of the first tooth portion 110 is approximately T-shaped. The outer core 200 is arranged along the outer periphery of the inner core 100 and surrounds a circle, and in the radial direction, there is a gap between the outer core 200 and the inner core 100. The outer core 200 includes a plurality of second tooth portions 210, for example, the number of the second tooth portions 210 is four, the second tooth portions 210 are arranged inwardly in the radial direction, and the plurality of second tooth portions 210 are arranged equidistantly in the circumferential direction. Similarly, in the projection plane perpendicular to the axial direction, the projection of the second tooth portion 210 is approximately T-shaped.

[0069] Referring to FIGS. 1 and 2, it can be understood that in this embodiment, the number of magnetic tiles 300 is eight, of course, the number of magnetic tiles 300 can also be six, ten, etc. The plurality of magnetic tiles 300 are installed on the outer peripheral wall of the outer core 200 and arranged equidistantly in the circumferential direction. Generally, the magnetic tiles 300 are adhered to the outer peripheral wall of the outer core 200 by glue to achieve preliminary fixation and positioning, or the magnetic tiles 300 are not adhered to the outer core 200 and are positioned on the outer peripheral wall of the outer core 200 by a mold.

[0070] Referring to FIGS. 2 and 3, it can be understood that the plastic package 400 is made of engineering plastic by an injection molding process, specifically, the engineering plastic is injected into a mold of the positioning magnetic shoe 300 and the outer core 200, and the cooled engineering plastic forms the plastic package 400, which wraps the magnetic shoe 300 and the outer core 200, so that the magnetic shoe 300 is fixedly installed on the outer peripheral wall of the outer core 200. The plastic package 400 includes a first end wall 450 and a second end wall 460, which are respectively located at the two axial ends of the plastic package 400, and the first end wall 450 and the second end wall 460 respectively cover the end faces of the outer core 200 at the two axial ends, and the first end wall 450 and the second end wall 460 both only cover part of the end faces of the outer core 200, for example, only cover the annular region close to the outer side of the end face, so that the axial constraint is formed between the plastic package 400 and the outer core 200, the plastic package 400 is combined with the outer core 200, and the installation stability of the magnetic shoe 300 is ensured.

[0071] Referring to FIGS. 2 and 4, it can be understood that the damping body 500 is made of an elastic damping material, which can be rubber or the like, by an injection molding process. The damping body 500 has a certain elasticity and can have a certain buffering effect when subjected to force, absorbing impact energy and achieving the effect of damping. On the basis that the plastic encapsulation body 400 is encapsulated on the magnetic tile 300 and the outer iron core 200 to form a whole, the inner iron core 100 is positioned inside the above whole by a mold, and the elastic damping material is injected into the space between the outer iron core 200 and the inner iron core 100. The cooled elastic damping material forms the damping body 500, so that the damping body 500 wraps the inner iron core 100 and part of the outer iron core 200. The damping body 500 includes a third end wall 560 and a fourth end wall 570, which are respectively located at the two ends of the damping body 500 in the axial direction. The third end wall 560 and the fourth end wall 570 cover the end faces of the inner iron core 100 at the two ends in the axial direction, and also cover another part of the end faces of the outer iron core 200 at the two ends in the axial direction. Generally, the end faces of the plastic encapsulation body 400 and the end faces of the damping body 500 are flush, so as to ensure that the end faces of the rotor assembly are flush and facilitate installation. In this way, axial constraints are formed between the damping body 500 and the inner iron core 100, and between the damping body 500 and the outer iron core 200. Since the inner iron core 100 has the first tooth portion 110 and the outer iron core 200 has the second tooth portion 210, it can be easily understood that the damping body 500 wraps the first tooth portion 110 and the second tooth portion 210, so that the damping body 500 forms radial constraints and circumferential constraints with the inner iron core 100 and the outer iron core 200 respectively, so that the inner iron core 100 and the outer iron core 200 are combined with each other to ensure the structural stability of the rotor assembly. At the same time, the damping body 500 can provide a buffering effect, reduce vibration, and reduce operating noise.

[0072] It can be understood that, due to the large difference in shrinkage rates of the engineering plastic, the elastic damping material, the inner iron core 100, and the outer iron core 200, the engineering plastic and the elastic damping material shrink after cooling, a gap is generated at the joint of the engineering plastic and the elastic damping material, the contact area is reduced, the axial friction force is reduced, and the axial binding force is reduced. At the same time, on the basis that the damping body 500 only wraps part of the end face of the outer iron core 200, the binding force between the damping body 500 and the outer iron core 200 is small, especially the axial binding force is poor. In this way, the combination effect of the inner iron core 100 and the outer iron core 200 is poor, and relative displacement or separation is likely to occur. It can be easily understood that the binding force can be understood as the reaction force of the force applied when two components are just separated.

[0073] For this purpose, referring to FIGS. 1-5, it can be understood that the plastic body 400 further comprises a first part, and the damping body 500 comprises a second part, and the projection of the first part overlaps the projection of the second part on the projection plane perpendicular to the axial direction, and the first part and the second part abut against each other on the opposite two wall surfaces perpendicular to the axial direction. In this way, the first part and the second part form a constraint in the axial direction, that is, the constraint between the plastic body 400 and the damping body 500 in the axial direction is increased, thereby increasing the axial binding force between the plastic body 400 and the damping body 500, and further increasing the axial binding force between the outer iron core 200 and the inner iron core 100.

[0074] Referring to FIGS. 3-5, it can be understood that the plastic body 400 is provided with a first recess 410 at one end in the axial direction, and the first recess 410 is recessed in the axial direction, and correspondingly, the damping body 500 is provided with a limiting portion 510 accommodated in the first recess 410, so that the axial constraint between the plastic body 400 and the damping body 500 can be formed. The solid structure on the plastic body 400 corresponding to the first recess 410 in the axial direction is the first part, and the limiting portion 510 is the second part. Since the limiting portion 510 is accommodated in the first recess 410, it is obvious that the limiting portion 510 and the first part abut against each other and overlap in the projection on the projection plane perpendicular to the axial direction.

[0075] Referring to FIGS. 3-5, it can be understood that the plastic body 400 further comprises at least one connecting strip 420 arranged in the axial direction and abutting against the inner circumferential wall of the outer iron core 200, the connecting strip 420 is located between two adjacent second tooth portions 210, and the connecting strip 420 is arranged in radial direction corresponding to the end portions of the opposite two ends of the adjacent two magnetic tiles 300 in the circumferential direction, so that the connecting strip 420 cooperates with the wall body of the plastic body 400 wrapped on the outer side of the magnetic tile 300 to realize radial clamping of the magnetic tile 300 and the outer iron core 200, which is conducive to further enhancing the installation stability of the magnetic tile 300. Correspondingly, the damping body 500 is provided with a recessed cavity 520 located on the outer circumferential wall of the damping body 500 and extending in the axial direction, and the connecting strip 420 is accommodated in the recessed cavity 520, so that the circumferential binding force between the damping body 500 and the plastic body 400 can be further increased.

[0076] Referring to FIGS. 3-5, it can be understood that in the embodiment, the first recess 410 is arranged at the end of the connecting strip 420 in the axial direction, and the first recess 410 is arranged in the axial direction relative to the end surface of the plastic package 400. At this time, the connecting strip 420 is the first part. Correspondingly, the limiting part 510 is located at one end of the cavity 520 in the axial direction, and the limiting part 510 is part of the third end wall 560 or the fourth end wall 570 of the damping body 500. The limiting part 510 is accommodated in the first recess 410, that is, the limiting part 510 is located at the end of the connecting strip 420 in the axial direction. Therefore, the connecting strip 420 and the limiting part 510 are constrained in the axial direction, that is, the constraint between the plastic package 400 and the damping body 500 in the axial direction is increased, thereby increasing the axial binding force between the plastic package 400 and the damping body 500, and further increasing the axial binding force between the outer iron core 200 and the inner iron core 100. In the process of rotating the rotor assembly or in the falling working condition, the relative displacement or separation of the outer iron core 200 and the inner iron core 100 can be avoided, which is beneficial to improve the structural stability of the rotor assembly.

[0077] It can be understood that the first recess 410 can be arranged at both ends of the connecting strip 420 in the axial direction. Correspondingly, the damping body 500 has the limiting part 510 at both ends in the axial direction, and the limiting part 510 at both ends is correspondingly accommodated in the first recess 410 at both ends. Here, it will not be repeated. Therefore, the axial binding force between the plastic package 400 and the damping body 500 can be further increased, the axial binding force between the outer iron core 200 and the inner iron core 100 can be increased, and the structural stability of the rotor assembly can be improved.

[0078] Referring to FIGS. 3-5, it can be understood that the number of connecting strips 420 is multiple. In the embodiment, the number of connecting strips 420 is four, and the four connecting strips 420 and the four second teeth 210 are arranged alternately and spaced apart in the circumferential direction. The first recess 410 is arranged at both ends of each connecting strip 420 in the axial direction, or only part of the connecting strips 420 has the first recess 410 arranged at both ends in the axial direction, or each connecting strip 420 has the first recess 410 arranged at one end in the axial direction. Correspondingly, the damping body 500 is provided with the limiting part 510 corresponding to the first recess 410. In this way, the constraint between the plastic package 400 and the damping body 500 in the axial direction can be further increased, the axial binding force between the outer iron core 200 and the inner iron core 100 can be increased, and the structural stability of the rotor assembly can be improved.

[0079] It can be understood that in other embodiments, the first recess 410 can be arranged on the axial end surface of the plastic package 400, the first recess 410 communicates with the space surrounded by the plastic package 400, and the solid structure on the plastic package 400 corresponding to the first recess 410 in the axial direction is the first part. Correspondingly, the limiting portion 510 is connected to the third end wall 560 or the fourth end wall 570 of the damping body 500 and is arranged outwardly and protrudingly in the radial direction, and the limiting portion 510 is accommodated in the first recess 410, and the limiting portion 510 is the second part. In this way, the limiting portion 510 and the first part are axially constrained with each other, and the axial constraint between the plastic package 400 and the damping body 500 can also be increased, so as to increase the axial binding force between the outer iron core 200 and the inner iron core 100, and the structural stability of the rotor assembly is improved.

[0080] The constraint structure of the first part and the second part at one place is further described below.

[0081] Referring to FIGS. 3-5, it can be understood that the damping body 500 is provided with a second recess 530 corresponding to the limiting portion 510 one by one, specifically, the second recess 530 is located on the side of the limiting portion 510 facing the connecting strip 420, that is, the second recess 530 is located on the side of the limiting portion 510 in the axial direction. The end of the connecting strip 420 in the axial direction is accommodated in the second recess 530. Therefore, the constraint between the connecting strip 420 and the damping body 500 in the circumferential direction can be further increased, and the contact area between the plastic package 400 and the damping body 500 is also increased, to a certain extent, the axial binding force between the plastic package 400 and the damping body 500 is also increased, so as to enhance the combination of the outer iron core 200 and the inner iron core 100, and the structural stability of the rotor assembly is further improved.

[0082] Referring to FIGS. 6 and 7, it can be understood that the plastic package 400 is further provided with third recesses 430, which are arranged on part of the bottom wall of the first recess 410. Correspondingly, the bottom wall of the first recess 410 is provided with first protrusions 540 arranged correspondingly with the third recesses 430, which are accommodated in the third recesses 430. Specifically, the number of the third recesses 430 is two, which are arranged at intervals along the circumference and located on both sides of the connecting strip 420 along the circumference, and the third recesses 430 are open towards one side of the inner core 100, that is, the third recesses 430 extend to the side wall of the connecting strip 420 towards the inner core 100 along the radial direction, and the third recesses 430 extend from the inner circumferential wall of the outer core 200. That is, the end of the connecting strip 420 along the axial direction is formed with a stepped structure with a middle part being high and both sides being low along the circumference. Correspondingly, the bottom wall of the second recess 530 is provided with first protrusions 540 at both ends along the circumference, and the two first protrusions 540 are correspondingly accommodated in the two third recesses 430. Therefore, the constraint of the connecting strip 420 and the damping body 500 along the circumference can also be increased, and the contact area of the plastic package 400 and the damping body 500 is also increased, which to some extent also increases the axial binding force between the plastic package 400 and the damping body 500, thereby enhancing the combination of the outer core 200 and the inner core 100, which is conducive to further improving the structural stability of the rotor assembly.

[0083] Referring to FIGS. 8 to 11, it can be understood that the plastic package 400 is further provided with fourth recesses 440, specifically, the fourth recesses 440 are formed on part of the bottom wall of the third recesses 430, and the fourth recesses 440 are located on one side of the third recesses 430 close to the outer core 200. In this embodiment, the bottom wall of the third recess 430 is provided with two fourth recesses 440, which are arranged at intervals along the circumference. Correspondingly, the damping body 500 comprises second protrusions 550, specifically, the second protrusions 550 are arranged on the end face of the first protrusions 540, and the positions of the second protrusions 550 are arranged correspondingly with the positions of the fourth recesses 440. That is, the end face of the first protrusion 540 is provided with two second protrusions 550 corresponding to the fourth recesses 440, and the two second protrusions 550 are located on one side of the first protrusion 540 close to the outer core 200, so that the first protrusion 540 and the two second protrusions 550 combine to form a hook structure. The two second protrusions 550 are correspondingly accommodated in the two fourth recesses 440. Therefore, the second protrusions 550 and the plastic package 400 form a constraint along the radial direction, so that the radial constraint force between the damping body 500 and the plastic package 400 can be increased, and the contact area of the plastic package 400 and the damping body 500 is also increased, which to some extent also increases the axial binding force between the plastic package 400 and the damping body 500, thereby enhancing the combination of the outer core 200 and the inner core 100, which is conducive to further improving the structural stability of the rotor assembly.

[0084] Referring to FIGS. 12 and 13, it can be understood that in some other embodiments, the plastic package 400 is provided with a third recess 430, which is arranged on a part of the bottom wall of the first recess 410. Specifically, the number of the third recess 430 is two, the two third recesses 430 are arranged at intervals along the circumference and located on both sides of the connecting strip 420 along the circumference, and the third recess 430 is located on the side of the first recess 410 close to the outer iron core 200, the third recess 430 is closed toward the side of the inner iron core 100, and the third recess 430 is open toward the circumferential two sides of the connecting strip 420. In this way, the bottom of the first recess 410 forms a T-shaped structure, and the top end of the T-shaped structure faces the inner iron core 100. Correspondingly, the bottom wall of the second recess 530 is provided with a first protrusion 540 at both ends along the circumference, the first protrusion 540 is located on the side of the second recess 530 close to the outer iron core 200, and the two first protrusions 540 are arranged one by one corresponding to the two third recesses 430. The two first protrusions 540 are correspondingly accommodated in the two third recesses 430. Therefore, at this time, the first protrusion 540 and the plastic package 400 form a radial constraint, thereby increasing the radial constraint force between the shock-absorbing body 500 and the plastic package 400, and at the same time, increasing the contact area between the plastic package 400 and the shock-absorbing body 500, to a certain extent, also increasing the axial binding force between the plastic package 400 and the shock-absorbing body 500, thereby enhancing the binding of the outer iron core 200 and the inner iron core 100, which is conducive to further improving the structural stability of the rotor assembly.

[0085] Referring to FIGS. 14-17, it can be understood that in some other embodiments, the plastic encapsulation 400 includes a first flange 470 located at the inner periphery of the outer core 200 and protruding radially inwardly towards the inner core 100, i.e., the first flange 470 protrudes from the inner periphery wall of the outer core 200. In the axial direction, the first flange 470 is away from both axial ends of the plastic encapsulation 400, i.e., the first flange 470 is located between the axial ends of the plastic encapsulation 400, for example, the first flange 470 is located at the middle of the plastic encapsulation 400 in the axial direction, or the first flange 470 is located between the end of the plastic encapsulation 400 and the middle of the plastic encapsulation 400 in the axial direction. The first flange 470 is a first part of the plastic encapsulation 400. Correspondingly, the shock absorber 500 is provided with a fifth recess 580 located at the outer periphery wall of the shock absorber 500 and having an opening facing the outer core 200. The fifth recess 580 is arranged corresponding to the position of the first flange 470 in the axial direction and can accommodate the first flange 470. It can be easily understood that the structure of the shock absorber 500 located on both sides of the fifth recess 580 in the axial direction is a second part of the shock absorber 500. Therefore, the first flange 470 is accommodated in the fifth recess 580, i.e., the first flange 470 is embedded in the shock absorber 500, and in the projection plane perpendicular to the axial direction, the projection of the first flange 470 overlaps the projection of the structure of the shock absorber 500 located on both sides of the fifth recess 580 in the axial direction, and the first flange 470 interferes with the two opposite walls of the structure of the shock absorber 500 located on both sides of the fifth recess 580 in the axial direction. Therefore, the first flange 470 and the structure of the shock absorber 500 located on both sides of the fifth recess 580 in the axial direction form a constraint in the axial direction, i.e., in both directions of the axial direction, thereby increasing the constraint of the plastic encapsulation 400 and the shock absorber 500 in the axial direction, achieving the increase of the axial binding force between the plastic encapsulation 400 and the shock absorber 500, and further increasing the axial binding force between the outer core 200 and the inner core 100, which can avoid the relative displacement or separation of the outer core 200 and the inner core 100 during the rotation of the rotor assembly or in the drop working condition, and is conducive to improving the structural stability of the rotor assembly.

[0086] It can be understood that, since the first flange 470 is located at the middle position of the plastic package 400 along the axial direction, or the first flange 470 is located between the end and the middle position of the plastic package 400, that is, the first flange 470 is away from the end of the plastic package 400 along the axial direction, and the fifth recess 580 corresponds to the position of the first flange 470 along the axial direction, that is, the fifth recess 580 is away from the end of the damping body 500 along the axial direction, therefore, the structure on the damping body 500 located on both sides of the fifth recess 580 along the axial direction has a larger thickness along the axial direction, and the deformation amount of the structure along the axial direction under the stress state is smaller, thus, it is beneficial to enhance the combination of the first flange 470 and the damping body 500 along the axial direction, that is, to enhance the combination of the plastic package 400 and the damping body 500 along the axial direction, thereby further increasing the axial combination force between the plastic package 400 and the damping body 500, and further increasing the combination force of the outer iron core 200 and the inner iron core 100, and improving the structural stability of the rotor assembly.

[0087] It can be understood that, under the same force, since the deformation amount of the engineering plastic with the same thickness is smaller than that of the elastic damping material, the first flange 470 is arranged on the plastic package 400, so that the deformation amount of the first flange 470 under the stress state is relatively small, thereby further enhancing the combination of the first flange 470 and the damping body 500 along the axial direction, enhancing the combination of the plastic package 400 and the damping body 500 along the axial direction, thereby further increasing the axial combination force between the plastic package 400 and the damping body 500, and further increasing the combination force of the outer iron core 200 and the inner iron core 100, and improving the structural stability of the rotor assembly.

[0088] Referring to FIGS. 14-17, it can be understood that the first flange 470 is connected to the connecting strip 420, specifically, the first flange 470 is located between the two ends of the connecting strip 420 along the axial direction, for example, the first flange 470 is located at the middle position of the connecting strip 420 along the axial direction, and the first flange 470 protrudes from the side wall of the connecting strip 420, so that the first flange 470 is arranged protruding towards the inner iron core 100. Correspondingly, the fifth recess 580 is arranged on the side wall of the recess cavity 520, and the opening of the fifth recess 580 faces the outer iron core 200. Similarly, the first flange 470 is accommodated in the fifth recess 580, achieving the increase of the axial combination force of the outer iron core 200 and the inner iron core 100, and improving the structural stability of the rotor assembly. Since the first flange 470 is connected to the connecting strip 420, the thickness of the connecting strip 420 along the radial direction is relatively large, which is beneficial to improve the connection stability of the first flange 470.

[0089] It can be understood that each connecting strip 420 can be connected with a first flange 470, or two adjacent connecting strips 420 are respectively connected with a first flange 470, or two opposite connecting strips 420 are respectively connected with a first flange 470, or three connecting strips 420 are respectively connected with a first flange 470. Correspondingly, the side wall of the concave cavity 520 of the damping body 500 is provided with a fifth recess 580 corresponding to the position of the first flange 470, which will not be described here. Therefore, the constraint of the plastic package 400 and the damping body 500 in the axial direction can be further increased, the axial binding force between the outer iron core 200 and the inner iron core 100 is increased, and the structural stability of the rotor assembly is improved.

[0090] It can be understood that the first flange 470 is located at the middle position of the connecting strip 420 in the axial direction, and correspondingly, the fifth recess 580 is located at the middle position of the damping body 500 in the axial direction, so that the thickness of the structure on the damping body 500 on both sides of the fifth recess 580 in the axial direction is equal. Therefore, the binding force of the first flange 470 and the damping body 500 in both directions in the axial direction is large, which is beneficial to further enhance the combination of the plastic package 400 and the damping body 500, increase the axial binding force between the outer iron core 200 and the inner iron core 100, and improve the structural stability of the rotor assembly.

[0091] Referring to FIGS. 15 and 16, it can be understood that the first flange 470 is located on the side of the connecting strip 420 close to the inner iron core 100 in the radial direction, that is, the first flange 470 protrudes from the wall surface of the connecting strip 420 facing the inner iron core 100 in the radial direction. The damping body 500 is provided with a fifth recess 580 corresponding to the first flange 470, which will not be described here. Therefore, the combination of the plastic package 400 and the damping body 500 can also be enhanced, the axial binding force between the outer iron core 200 and the inner iron core 100 is increased, and the structural stability of the rotor assembly is improved. And under the premise of meeting the bonding strength of the plastic package 400 and the damping body 500, the volume of the first flange 470 can be reduced, the amount of engineering plastic used is reduced, the cost is reduced, and demolding is facilitated.

[0092] Referring to FIGS. 18 and 19, it can be understood that in some other embodiments, each connecting strip 420 is connected with two first flanges 470, which are respectively located on both sides of the connecting strip 420 in the circumferential direction, that is, the two first flanges 470 protrude from the two side walls of the connecting strip 420 in the circumferential direction. Correspondingly, the two side walls of the recess 520 in the circumferential direction are respectively arranged in the fifth recesses 580 corresponding to the two first flanges 470. The two first flanges 470 are respectively accommodated in the two fifth recesses 580. Therefore, the bonding points of the plastic sealing body 400 and the damping body 500 can be increased, the bonding of the plastic sealing body 400 and the damping body 500 is further enhanced, the axial bonding force between the outer iron core 200 and the inner iron core 100 is increased, and the structural stability of the rotor assembly is improved.

[0093] Referring to FIGS. 20 and 21, it can be understood that in some other embodiments, the first flange 470 is arranged around the connecting strip 420, specifically, the first flange 470 extends from one side to the other side of the connecting strip 420 in the circumferential direction, that is, the first flange 470 protrudes from the wall surface of the connecting strip 420 facing the inner iron core 100 in the radial direction and protrudes from the two side walls of the connecting strip 420 in the circumferential direction. Therefore, the area of the first flange 470 can be increased, thereby increasing the bonding area of the first flange 470 and the damping body 500, enhancing the bonding of the plastic sealing body 400 and the damping body 500, increasing the axial bonding force between the outer iron core 200 and the inner iron core 100, and improving the structural stability of the rotor assembly.

[0094] Referring to FIGS. 22 and 23, it can be understood that in some other embodiments, the connecting strip 420 includes a first segment 421 and a second segment 422, specifically, the first segment 421 and the second segment 422 are arranged in the axial direction, and the first segment 421 and the second segment 422 are respectively located on both sides of the first flange 470 in the axial direction. The first segment 421 and the second segment 422 are deviated from the middle position of the first flange 470 in the circumferential direction of the rotor assembly, and the first segment 421 and the second segment 422 are arranged in the circumferential direction of the rotor assembly, that is, the first segment 421 is close to one end of the first flange 470 in the circumferential direction of the rotor assembly, and the second segment 422 is close to the other end of the first flange 470 in the circumferential direction of the rotor assembly. Therefore, the wall surfaces on both sides of the first flange 470 in the axial direction are mostly concentrated on one side of the connecting strip 420 in the circumferential direction, so that the area of the concentrated area is larger, which is conducive to enhancing the bonding of the first flange 470 and the damping body 500, thereby enhancing the bonding of the plastic sealing body 400 and the damping body 500, increasing the axial bonding force between the outer iron core 200 and the inner iron core 100, and improving the structural stability of the rotor assembly.

[0095] It can be understood that in other embodiments, the first flange 470 can be connected to the inner circumferential wall of the plastic package 400 instead of being connected to the connecting strips 420, that is, the first flange 470 is located between the circumferentially adjacent connecting strips 420 and the second tooth portion 210, and the structure of the first flange 470 can be as described above, which will not be described here. Therefore, the combination of the plastic package 400 and the damping body 500 can be enhanced, the axial combination force between the outer iron core 200 and the inner iron core 100 can be increased, and the structural stability of the rotor assembly can be improved.

[0096] Referring to FIGS. 24-27, it can be understood that in other embodiments, in general, the height of the inner iron core 100 is less than the height of the outer iron core 200 in the axial direction, and the axial ends of the outer iron core 200 protrude from the axial ends of the inner iron core 100. The plastic package 400 includes a second flange 480 located at the inner circumferential wall of the outer iron core 200, and the second flange 480 protrudes radially towards the inner iron core 100, that is, the second flange 480 protrudes from the inner circumferential wall of the outer iron core 200. In the axial direction, the second flange 480 is arranged offset from the inner iron core 100, that is, the second flange 480 is not within the axial range of the inner iron core 100. For example, the second flange 480 is located on one side of the inner iron core 100 in the axial direction, and the second flange 480 is located between the end of the inner iron core 100 and the end of the plastic package 400 in the axial direction, or the second flange 480 is located at the end of the plastic package 400 in the axial direction. The second flange 480 is the first part of the plastic package 400. Correspondingly, the damping body 500 is provided with a sixth recess 590 arranged corresponding to the position of the second flange 480 in the axial direction, and the sixth recess 590 is arranged at the outer circumferential wall of the damping body 500 and opens towards the outer iron core 200, and the sixth recess 590 can accommodate the second flange 480. For example, when the second flange 480 is located between the end of the inner iron core 100 and the end of the plastic package 400 in the axial direction, the sixth recess 590 is also located between the end of the inner iron core 100 and the end of the plastic package 400 in the axial direction, and the structure of the damping body 500 on the axial both sides of the sixth recess 590 is the second part of the damping body 500; or when the second flange 480 is located at the end of the plastic package 400 in the axial direction, the sixth recess 590 is located at the axial end of the damping body 500, and the sixth recess 590 is open on one side in the axial direction, and the structure of the damping body 500 on one side of the sixth recess 590 in the axial direction is the second part of the damping body 500.

[0097] Therefore, the second flange 480 is accommodated in the sixth recess 590, i.e., the second flange 480 is embedded in the damping body 500, in a projection plane perpendicular to the axial direction, a projection of the second flange 480 overlaps with projections of structures on the damping body 500 on both sides (or one side) of the sixth recess 590 in the axial direction, and the second flange 480 interferes with the opposite two wall surfaces of the structures on the damping body 500 on both sides (or one side) of the sixth recess 590 in the axial direction. Therefore, the second flange 480 and the structures on the damping body 500 on both sides (or one side) of the sixth recess 590 in the axial direction form a constraint in the axial direction, thereby increasing the constraint of the plastic package 400 and the damping body 500 in the axial direction, achieving an increase in the axial binding force between the plastic package 400 and the damping body 500, and further increasing the axial binding force between the outer iron core 200 and the inner iron core 100, so as to avoid relative displacement or separation of the outer iron core 200 and the inner iron core 100 during rotation of the rotor assembly or in a drop working condition, and facilitate improvement of the structural stability of the rotor assembly.

[0098] It can be understood that, under the same force, since the deformation amount of the engineering plastic with the same thickness is smaller than that of the elastic damping material, the second flange 480 is arranged on the plastic package 400, so that the deformation amount of the second flange 480 is relatively small in a stressed state, thereby further enhancing the axial binding of the second flange 480 and the damping body 500, enhancing the axial binding of the plastic package 400 and the damping body 500, thereby further increasing the axial binding force between the plastic package 400 and the damping body 500, and further increasing the binding force between the outer iron core 200 and the inner iron core 100, and improving the structural stability of the rotor assembly.

[0099] It can be understood that, since the deformation amount of the second flange 480 is relatively small in a stressed state, the damping effect of the second flange 480 is poor. Therefore, the second flange 480 is arranged to be staggered with the inner iron core 100 in the axial direction of the rotor assembly, i.e., in the radial direction, the second flange 480 is not located in the space between the inner iron core 100 and the outer iron core 200, avoiding the second flange 480 from affecting the damping effect of the damping body 500, and at the same time, the radial thickness of the damping body 500 filled between the inner iron core 100 and the outer iron core 200 is large, effectively ensuring the damping effect.

[0100] Referring to FIGS. 24-27, it can be understood that the second flange 480 is located at the end of the plastic package 400 in the axial direction, and is maximally away from the inner iron core 100 in the axial direction, thereby effectively ensuring the damping effect. At the same time, since the second flange 480 is located at the end of the plastic package 400, it is more convenient to demold after the plastic package 400 is formed, and is convenient for production.

[0101] Referring to FIGS. 1 and 2, it can be understood that, in some other embodiments, the plastic sealing body 400 is provided with a second flange 480 at both axial ends, and the damping body 500 is provided with a sixth recess 590 at the end faces of both axial ends, and the second flanges 480 at both axial ends are correspondingly accommodated in the sixth recesses 590 at both axial ends. Thus, the plastic sealing body 400 and the damping body 500 can be further constrained in the axial direction, and the plastic sealing body 400 and the damping body 500 are constrained in both axial directions, so as to increase the axial binding force between the outer iron core 200 and the inner iron core 100, and further improve the structural stability of the rotor assembly.

[0102] It can be understood that, in some other embodiments, the third end wall 560 has a thickness smaller than that of the fourth end wall 570 in the axial direction. Thus, under the same stress, the deformation amount of the fourth end wall 570 is smaller than that of the third end wall 560, and the axial constraint between the fourth end wall 570 and the outer iron core 200 is better than that between the third end wall 560 and the outer iron core 200. The plastic sealing body 400 is provided with the second flange 480 at only one end in the axial direction, and the second flange 480 and the third end wall 560 are located at the same end of the rotor assembly, and correspondingly, the third end wall 560 of the damping body 500 is provided with the sixth recess 590 for accommodating the second flange 480. Thus, under the premise that the axial constraint between the fourth end wall 570 and the outer iron core 200 is better, by increasing the second flange 480 for forming the axial constraint with the damping body 500 at the end where the third end wall 560 is located, the constraint between the plastic sealing body 400 and the damping body 500 at the end where the third end wall 560 is located is increased, so as to increase the axial binding force between the outer iron core 200 and the inner iron core 100, and further improve the structural stability of the rotor assembly.

[0103] Referring to FIGS. 24 to 27, it can be understood that, in any of the above embodiments, the second flange 480 is connected to the connecting strip 420. Specifically, in the present embodiment, the second flange 480 is located at the end of the connecting strip 420 in the axial direction and protrudes from the side wall of the connecting strip 420, and the second flange 480 protrudes towards the inner iron core 100 in the radial direction. Correspondingly, the sixth recess 590 is arranged at the side wall of the recess cavity 520 and located at the end of the recess cavity 520 in the axial direction, the opening of the sixth recess 590 faces the outer iron core 200, and one end of the sixth recess 590 is open in the axial direction. The second flange 480 is accommodated in the sixth recess 590, so as to increase the axial binding force between the outer iron core 200 and the inner iron core 100, and further improve the structural stability of the rotor assembly. Since the second flange 480 is connected to the connecting strip 420, the thickness of the connecting strip 420 in the radial direction is relatively large, which is conducive to improving the connection stability of the second flange 480.

[0104] It can be understood that one second flange 480 can be connected to any one end of each connecting strip 420, or two adjacent connecting strips 420 are respectively connected with one second flange 480, or two opposite connecting strips 420 are respectively connected with one second flange 480, or three connecting strips 420 are respectively connected with one second flange 480. Correspondingly, the side wall of the concave cavity 520 of the damping body 500 is provided with a sixth recess 590 corresponding to the position of the second flange 480, which will not be described here. Therefore, the constraint of the plastic sealing body 400 and the damping body 500 in the axial direction can be further increased, the axial binding force between the outer iron core 200 and the inner iron core 100 is increased, and the structural stability of the rotor assembly is improved.

[0105] It can be understood that in other embodiments, the axial ends of each connecting strip 420 are respectively connected with a second flange 480, or only part of the axial ends of the connecting strip 420 are connected with a second flange 480, or part of the axial ends of the connecting strip 420 are respectively connected with a second flange 480, and the other part of the axial end of the connecting strip 420 is connected with a second flange 480. Therefore, the constraint of the plastic sealing body 400 and the damping body 500 in the axial direction can be further increased, the axial binding force between the outer iron core 200 and the inner iron core 100 is increased, and the structural stability of the rotor assembly is improved.

[0106] It can be understood that the plastic sealing body 400 is also provided with a through hole 490, specifically, the through hole 490 is formed in the second flange 480 and penetrates the two end faces of the second flange 480 in the axial direction. Correspondingly, the damping body 500 includes a connecting column 521, one end of the connecting column 521 is connected to the bottom wall of the sixth recess 590 in the axial direction, and the other end extends in the axial direction, and the connecting column 521 is accommodated in the through hole 490. Therefore, by providing the connecting column 521, the damping body 500 forms a structure similar to a hook, so that the connecting column 521 and the plastic sealing body 400 are constrained in the radial and circumferential directions, thereby increasing the radial and circumferential constraint forces between the damping body 500 and the plastic sealing body 400, and increasing the contact area between the plastic sealing body 400 and the damping body 500 to a certain extent, thereby increasing the axial binding force between the plastic sealing body 400 and the damping body 500, thereby enhancing the binding of the outer iron core 200 and the inner iron core 100, and further improving the structural stability of the rotor assembly.

[0107] It can be understood that, as shown in FIGS. 28-31, in some other embodiments, the plastic sealing body 400 is provided with a through hole 490 formed in the connecting strip 420 and arranged in the axial direction, and the through hole 490 is a blind hole structure in the axial direction. The through hole 490 extends in the axial direction from the end surface of the plastic sealing body 400 and beyond the second flange 480 at the same end, and the part of the through hole 490 beyond the second flange 480 penetrates the connecting strip 420 in the radial direction towards the side wall of the inner core 100. Similarly, the damping body 500 includes a connecting column 521 connected to the side wall of the concave cavity 520 at one end in the axial direction and extending in the axial direction and protruding from the bottom wall of the sixth recess 590 at the other end, and the connecting column 521 is accommodated in the through hole 490, and similarly, the damping body 500 is formed with a similar hook structure, which will not be described here. Therefore, on the one hand, the thickness of the connecting column 521 in the radial direction can be increased, the structural stability of the connecting column 521 can be improved, and the combination of the plastic sealing body 400 and the damping body 500 can be enhanced; on the other hand, the connecting column 521 and the connecting strip 420 are constrained in the axial direction, and of course, are also constrained in the radial direction and the circumferential direction, thereby further increasing the constraint of the plastic sealing body 400 and the damping body 500, increasing the axial combination force between the plastic sealing body 400 and the damping body 500, thereby enhancing the combination of the outer core 200 and the inner core 100, and facilitating to further improve the structural stability of the rotor assembly.

[0108] It can be understood that, in some other embodiments, the second flange 480 can be connected to the inner peripheral wall of the plastic sealing body 400 instead of being connected to the connecting strip 420, that is, the second flange 480 is located between the connecting strip 420 and the second tooth portion 210 adjacent in the circumferential direction, and the structure of the second flange 480 can refer to the above description, which will not be described here. Therefore, the combination of the plastic sealing body 400 and the damping body 500 can be enhanced, the axial combination force between the outer core 200 and the inner core 100 can be increased, and the structural stability of the rotor assembly can be improved.

[0109] The motor of the second aspect embodiment of the present application comprises the rotor assembly of the first aspect embodiment of the present application.

[0110] The motor adopts all the technical solutions of the rotor assembly of the above-mentioned embodiments, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0111] The household appliance of the third aspect embodiment of the present application comprises the motor of the second aspect embodiment of the present application, and the household appliance can be an air conditioner, a washing machine, a refrigerator, etc., which will not be described here.

[0112] The household appliance adopts all the technical solutions of the motor of the above-mentioned embodiments, and therefore at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments.

[0113] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. A rotor assembly, comprising: an inner core; an outer core arranged along an outer periphery of the inner core; a plurality of magnetic tiles mounted to an outer peripheral wall of the outer core and arranged along a circumferential direction of the outer core; a plastic encapsulation encapsulating the magnetic tiles and the outer core; and a damping body filled between the inner core and the outer core; wherein the plastic encapsulation comprises a first portion, the damping body comprises a second portion, projections of the first portion and the second portion overlap on a projection plane perpendicular to an axial direction of the rotor assembly, and opposite two wall surfaces of the first portion and the second portion perpendicular to the axial direction abut each other. The plastic encapsulation is provided with a first recess along at least one end in the axial direction, the first recess is recessed along the axial direction, and the damping body is provided with a limiting portion accommodated in the first recess.

2. The rotor assembly of claim 1, wherein, The plastic encapsulation comprises at least one connecting strip arranged along the axial direction and abutting an inner peripheral wall of the outer core, the first recess is arranged at an end of the connecting strip along the axial direction, the damping body is provided with a recess cavity accommodating the connecting strip, and the limiting portion is located at an end of the recess cavity along the axial direction.

3. The rotor assembly of claim 2, wherein, The damping body is provided with a second recess located at one side of the limiting portion along the axial direction, and the connecting strip is partially accommodated in the second recess.

4. The rotor assembly of claim 3, wherein, The number of the connecting strips is plural, and the plural connecting strips are arranged along the circumferential direction of the outer core at intervals, and each of the connecting strips is provided with the first recess.

5. The rotor assembly of claim 3 or 4, wherein, The plastic encapsulation is further provided with a third recess arranged at a partial bottom wall of the first recess, a bottom wall of the second recess is provided with a first protrusion, and the first protrusion is accommodated in the third recess.

6. The rotor assembly of claim 4 or 5, wherein, The number of the third recesses is two, and the two third recesses are arranged along the circumferential direction at intervals.

7. The rotor assembly of claim 6, wherein, The third recesses extend along a radial direction of the outer core to a side wall of the connecting strip facing the inner core.

8. The rotor assembly of claim 6 or 7, wherein, The plastic encapsulation is further provided with a fourth recess formed at a partial bottom wall of the third recess and located at a side of the third recess close to the outer core, an end surface of the first protrusion is provided with a second protrusion, and the second protrusion is accommodated in the fourth recess.

9. The rotor assembly of claim 8, wherein, The third recess is located at a side of the second recess close to the outer core.

10. The rotor assembly of any one of claims 6 to 9, wherein, 11.A motor comprising the rotor assembly according to any one of claims 1 to 10. 12.A household appliance comprising the motor according to claim 11. ​

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